Which circle has a central angle that measures 40°? Circle U is shown. Line segment Z X is a diameter. Line segment V X is a secant. Angle V X Z is 40 degrees. Circle U is shown. Line segments U V and U Z are radii. Angle V U Z is 40 degrees. Circle U is shown. Line segment Z V is a secant. Line segment Z X is a tangent. Angle X Z V is 40 degrees. Circle U is shown. Line segments X V and X Z are secants. Angle V X Z is 40 degrees.